Class 5 Exam  >  Class 5 Notes  >  Science Class 5  >  The Skeletal System

The Skeletal System | Science Class 5 PDF Download

Our body is a useful machine. It can perform many functions, which no other machine can. 

Introduction

The Skeletal System | Science Class 5


The skeletal system protects its soft internal organs. It provides shape to our body. The bones are attached to the muscles and help in movement. The skeletal system along with the muscular system, works together to make our body function like a perfect machine. 

The Skeletal System | Science Class 5

The Skeleton

  • The skeleton is the framework of bones which gives shape and strength to the body. 
  • It also protects our inner organs.
    The Skeleton protects the internal organs of the bodyThe Skeleton protects the internal organs of the body
  • The bones help us in moving our body with the help of our muscles. 
  • There are 300 - 350 bones in an infant and 206 bones in an adult human being.
    The Skeletal System | Science Class 5
  • This decrease in the number of bones from childhood to adult stage is due to the fusion of some bones. 
  • Bones require calcium, phosphorus and some vitamins like vitamin D for proper development. 
  • Nerves that run through the bones also need blood supply. They are filled with soft fatty material called bone marrow.
    The Skeletal System | Science Class 5
  • The red blood cells in the blood are made by the bone marrow 

Parts of Skeleton

The human skeleton consists of the skull, ribcage, backbone, limbs and the girdle (pectoral and pelvic girdle).

The Skeletal System | Science Class 5


The skull

The Skeletal System | Science Class 5

  • The bone of our head makes the skull. 
  • The cranium is a part of skull that protects the brain. 
  • It is made up of eight flat bones, which are interlocked together. 
  • Except the lower jaw, all the bones of the skull are fixed. The lower movable jaw enables us to eat and talk. 
  • The skull of an adult human generally contains 28 bones
  • Our face is made up of 14 bones, which protect important sense organs like the eyes, nose and tongue. 
  • The nose does not have a bone but it is made up of another strong and flexible material called cartilage.

Question for The Skeletal System
Try yourself:I protect the brain. I am made up of bones which are fused firmly together to form a shell-like structure. What am I?
View Solution

The backbone


The Skeletal System | Science Class 5

  • The skull is attached to the backbone, which forms the main axis of the skeleton. 
  • The backbone is made up of 33 small bones called vertebrae
  • They are linked together to form a vertebral column. 
  • It protects the spinal cord and is also known as the spine
  • Our backbone is flexible and helps us to bend or twist. 

The Ribcage 

The Skeletal System | Science Class 5

  • Ribs are narrow curved bones. 
  • 12 pairs of ribs form a cage around the chest, which is called the ribcage
  • Ribs are joined to the backbone and the sternum
  • All the 12 pairs of ribs are attached to the backbone but only 10 pairs of the ribs are attached to the sternum. 
  • Hence, the last two pair of ribs are called floating bones. The ribcage protects the heart, lungs and other internal organs. 
  • The movement of the ribs also helps in respiration.

Question for The Skeletal System
Try yourself:Look at the given diagram carefully. 
The Skeletal System | Science Class 5 

Which are the organs that the above given bones protect?

(i) Stomach

(ii) Lungs

(iii) Liver

(iv) Heart

View Solution

The Limbs

The Skeletal System | Science Class 5

  • There are two pairs of limbs in our body — fore limb and hind limb. 
  • The fore limbs are called arms and the hind limbs are called legs.
  • The arms are attached to the backbone with the help of the shoulder girdles, also known as pectoral girdles.
    The Skeletal System | Science Class 5
  • The shoulder girdles consist of a pair of collar bones, clavicle and a pair of shoulder blades, scapula
  • There are 27 bones in our hands and wrists, out of which the upper arm has a single long bone called the humerus, and the lower arm has two bones - radius and ulna together known as radio-ulna.
    The Skeletal System | Science Class 5
  • The hind limb is attached to the bottom of the backbone with the help of pelvic girdle
  • The upper part of the hind limb has a strong and powerful thigh bone called femur
  • Femur is the longest bone of our body. 
  • The lower leg has two bones - tibia and fibula - together known as tibio fibula.  
    The Skeletal System | Science Class 5

Girdle 

Our body has two types of girdle - pectoral girdle, also called shoulder girdle, and pelvic girdle, also called hip girdle. The girdles help in joining the limb directly to the backbone. The girdles are fixed to the backbone and lie on either side of it.

The Skeletal System | Science Class 5

Functions of the Skeletal System 

The skeleton has the following functions: 

  • The skeletal system gives shape, strength and support to the body. 
  • It protects the soft internal organs in the following ways:
    1. The skull protects the brain.
    2. The backbone protects the spinal cord.
    3. The ribcage protects the heart and the lungs.
    4. The hip bone protects organs like the kidneys and the bladder.
    5. The eye balls are protected by the bony eye sockets. 
  • It helps to move our body with the help of the muscles. 
  • Red blood cells and white blood cells are produced in the bone marrow. 
  • Bones also store minerals like calcium and phosphorus.

Question for The Skeletal System
Try yourself:Look at the list below.

Collar Bone
Ribcage
Kneecap
Backbone

To which body system do the bones in the list belong to?

View Solution

The document The Skeletal System | Science Class 5 is a part of the Class 5 Course Science Class 5.
All you need of Class 5 at this link: Class 5
44 videos|204 docs|45 tests

Up next

FAQs on The Skeletal System - Science Class 5

1. What are the main parts of the skeletal system?
Ans. The skeletal system is made up of several main parts, including the bones, joints, and connective tissues. The bones provide support and structure to the body, while the joints allow for movement and flexibility. The connective tissues, such as ligaments and tendons, help to hold the bones and joints together.
2. How does the skeletal system function?
Ans. The skeletal system has several important functions. Firstly, it provides support and structure to the body, allowing us to stand upright and move. Secondly, it protects vital organs, such as the brain, heart, and lungs, from injury. Additionally, the skeletal system produces red and white blood cells, stores minerals, and allows for movement through the action of muscles attached to the bones.
3. What is the role of joints in the skeletal system?
Ans. Joints play a crucial role in the skeletal system as they allow for movement and flexibility. There are different types of joints in the body, including hinge joints (like the elbow), ball-and-socket joints (like the hip), and pivot joints (like the neck). These joints are formed by the connection of two or more bones and are supported by ligaments, which provide stability and prevent excessive movement.
4. How do bones protect vital organs?
Ans. Bones serve as a protective shield for vital organs in the body. For example, the skull protects the brain, the ribcage protects the heart and lungs, and the spinal column protects the spinal cord. These bones act as a barrier, absorbing and dispersing the impact of external forces, thus reducing the risk of injury to the organs.
5. What are the functions of connective tissues in the skeletal system?
Ans. Connective tissues, such as ligaments and tendons, have important functions in the skeletal system. Ligaments connect bones to other bones, providing stability and strength to the joints. Tendons, on the other hand, connect muscles to bones, allowing for movement and transmitting the force generated by the muscles to the bones. These connective tissues help to hold the skeletal system together and facilitate movement.
44 videos|204 docs|45 tests
Download as PDF

Up next

Explore Courses for Class 5 exam
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Related Searches

Objective type Questions

,

The Skeletal System | Science Class 5

,

Sample Paper

,

Semester Notes

,

practice quizzes

,

MCQs

,

Important questions

,

study material

,

Previous Year Questions with Solutions

,

Exam

,

Viva Questions

,

Free

,

ppt

,

Extra Questions

,

pdf

,

shortcuts and tricks

,

past year papers

,

Summary

,

mock tests for examination

,

video lectures

,

The Skeletal System | Science Class 5

,

The Skeletal System | Science Class 5

;